Thermodynamic Properties of Layered Tetradymite-like Compounds of the Ag–Ge–Sb–Te System

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Publication Details

List of Authors: Mykola Moroz, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Daniel Lindberg, Oleksandr Reshetnyak, Leena Hupa
Editors: Jonghyn Lee, Samuel R. Wagstaff, Guillaume Lambotte, Antoine Allanore, Fiseha Tesfaye
Place: Switzerland AG
Publication year: 2020
Publisher: Springer
Book title: Materials Processing Fundamentals 2020
Title of series: The Minerals, Metals & Materials Series
Start page: 275
End page: 287
ISBN: 978-3-030-36555-4
eISBN: 978-3-030-36556-1
ISSN: 2367-1181


Abstract

The phase equilibria of the Ag–Ge–Sb–Te system in the part Ag8GeTe6–Ge–GeTe–Sb2Te3 were investigated by the electromotive force (EMF) method. The determined phase relations were used to express the chemical reactions. The potential-forming reactions were performed by applying electrochemical cells (−) C | Ag | Ag2GeS3-glass | D | C (+), where C is graphite, Ag2GeS3-glass is the fast purely Ag+ ions conducting electrolyte, and D is an equilibrium mixture of phases. According to the experimental data on the EMF versus temperature of each electrochemical cells, analytical equations for the Gibbs energies of GeSb8Te13, GeSb6Te10, GeSb4Te7, GeSb2Te4, Ge2Sb2Te5, Ge3Sb2Te6, and Ge4Sb2Te7 compounds were obtained. The thermodynamic properties of silver-saturated tetradymite-like compounds have been calculated for the first time. A good correspondence between experimental values and structure data reported in the literature has been established.


Keywords

EMF method, Phase equilibria, Renewable energy, Thermodynamic properties, Thermoelectric Materials

Last updated on 2020-17-02 at 06:04